Folding mobile communication terminal

ABSTRACT

A portable communication terminal having an image-taking function is composed of a camera unit that takes an image of a subject through a photographic lens, and two displays, the first display being positioned on same a front surface of housing of the portable communication terminal as the photographic lens and being visible in a same view as the photographic lens, and the second display being positioned on a back surface of the housing. The mobile communication terminal has a function of having the image taken by the camera unit displayed on at least one of the displays.

BACKGROUND OF THE INVENTION

(1) Field of the Invention

The present invention relates to a folding mobile communication terminalthat has an image-taking function.

(2) Description of the Related Art

In recent years mobile communication devices such as mobile telephoneshave become increasingly multi-functional, and more recently mobiletelephone devices having a CCD (Charge Coupled Device) camera arebecoming common. Such cameras use a semiconductor photodetector elementthat converts light to an electric signal.

In such a portable telephone having a camera, the CCD camera ispositioned on the back of the main body of the portable telephone, andan image of the subject taken by the CCD camera is displayed on an LCDscreen positioned on the front of the main body. Therefore, the user canconfirm through the screen display that the desired subject is in theview of the CCD camera before actually taking an image.

Note that “take an image” is used to denote forming an image of thesubject on the photodetecting surface of the semiconductor photodetectorthrough the lens of the camera and converting the formed image intoimage data.

However, since the LCD that displays the image of the subject taken bythe CCD camera is positioned on the front of the main body of theportable telephone and the CCD camera is positioned on the back of themain body, when the user attempts to take an image of him/herself,he/she cannot look at the LCD to check in advance that the subject(i.e., the user) is in a position for an image to be taken as desired.This gives rise to a problem that the user cannot take an image ofhim/herself as desired.

Such a problem can be solved by making the camera rotatable to face thesubject, but this results in an increase in the size of the portabletelephone and highs costs because a flexible circuit board must beprovided in the rotating unit. This is undesirable in portabletelephones since importance is placed on compactness, light weight andlow cost.

SUMMARY OF THE INVENTION

In view of the above-described problems, the object of theabove-described invention is to provide a portable communicationterminal that has a camera that is capable of taking an image of asubject as desired by the user, when the user is the subject of theimage and when an image of a subject other than the user is taken.

In order to achieve the stated object, the present invention is a mobilecommunication terminal, including a camera unit for taking an image of asubject through a camera lens; two displays, the first display beingpositioned on a same front surface of a body of the mobile communicationterminal as the lens so as to be visible in a same view as the lens, andthe second display being positioned on a back surface of the body; and adisplay control unit for having the image taken by the camera unitdisplayed on at least one of the two displays.

Furthermore, the first display may be fixed on the front surface of thebody and the second display may be fixed on the back surface of thebody. Furthermore, the mobile communication terminal may be a mobiletelephone that includes numeric keys for receiving an input of atelephone number, the numeric keys being on a same surface as one of thefirst display and the second display.

According to the stated construction, the user can check in advancewhether the subject is being displayed in the desired position bylooking at the image of the subject displayed on either of the displays,both in cases in which the user takes an image of him/herself as thesubject, and in cases when the user takes an image of another subject.Therefore, the user can easily obtain the desired still image of thesubject. Furthermore, the user can take an image in a comfortableposition without having to look through a viewing lens such as in anordinary camera.

Here, the mobile communication terminal may have a construction in whichthe camera unit includes: an emission sub-unit for emitting visiblelight from a position adjacent to the lens, so as to provide a guideshowing a position of the lens, and the display control unit includes:an instruction receiving unit for receiving from a user (a) apreparation instruction for having images of a subject displayed on atleast one of the displays successively after each image has been taken,and (b) a still image taking instruction for having a still image of thesubject displayed on at least one of the displays, and the displaycontrol unit, on reception of the preparation instruction by theinstruction receiving unit, has the emission sub-unit emit the visiblelight, and, on reception of the still image taking instruction by theinstruction receiving unit, has the emission sub-unit stop emitting thevisible light.

According to the stated construction, the user can estimate the positionof the lens and the position of the subject being taken by the lens byusing the visible light as a guide when it is dark. As a result, theuser can easily adjust him/herself to be in a position taken by thephotographic lens, and the process of taking an image can be finishedpromptly.

Here, the mobile communication terminal may have a construction in whichthe first display includes: a light emission unit for emitting light,the display control unit includes: an instruction receiving unit forreceiving a still image taking instruction for having a still image of asubject displayed on at least one of the displays, directly after thestill image has been taken, and the display control unit, on receptionof the still image taking instruction by the instruction receiving unit,has the light emission unit emit light.

According to the stated construction, even when taking an image in adark place, light exposure can be supplemented, and the display alsofunctions as a photographic lamp for the camera. Therefore, thecompactness of the mobile communication terminal is used effectively.Here, the mobile communication terminal may have a construction in whichthe display control unit has the taken image of the subject displayed ononly one of the two displays, the display control unit includes: a userinstruction reception unit for receiving from a user a display selectioninstruction for switching over the display displaying the taken image,and the display control unit, on receiving the display selectioninstruction, turns off the display performing image display, and has theimage displayed on the selected display.

According to the stated construction, the display that is not used intaking an image is turned off in response to user instruction. Thisreduces consumption of the battery.

Here, the mobile communication terminal may further include: a storageunit for storing data of the taken image of the subject; an electronicmail receiving unit for receiving from the user an input of anelectronic mail address; and a transmission unit for transmitting thestored image data to a mail server specified by the electronic mailaddress.

According to the stated construction, the still image that has beentaken can be transmitted straight away as e-mail to a mobilecommunication terminal of a friend, a family member, etc.

Furthermore, the present invention is a foldable mobile communicationterminal, including: a housing unit that is composed of a top housingand a bottom housing that are connected via a connection unit that actsas a pivot so that the housing unit is foldable and unfoldable; twodisplays, the first display being positioned on an outer surface of oneof the top housing and the bottom housing and being visible when thehousing unit is in a folded state, and the second display beingpositioned on an inner surface of one of the top housing and the bottomhousing and not being visible when the housing unit is in the foldedstate; a camera unit for taking an image of a subject through a cameralens that is positioned on one of the outer surface and the innersurface of one of the top housing and the bottom housing, so as to bevisible in a same view as one of the displays when the housing is in anunfolded state; a judgement unit for judging whether the housing unit isin the unfolded state or the folded state; and a display control unitfor having, when the judgement unit judges that the housing unit is inthe unfolded state, the taken image of the subject displayed on at leastone of the displays directly after the image has been taken.

Here, the first display may be fixed on the outer surface of the housingunit, and the second display may be fixed on the inner surface of thehousing unit. Here, the mobile communication terminal may be a foldablemobile telephone that includes numeric keys for receiving an input of atelephone number, the numeric keys being on a same surface as one of thefirst display and the second display.

According to the stated construction, the mobile communication terminalcan be carried in a convenient, folded state, and an image taken as soonas the mobile communication terminal has been put into an unfoldedstate. Therefore, the mobile communication terminal can be easilycarried anywhere, and the user can easily take an image when he/shefinds a suitable subject.

Here, the mobile communication terminal may have a construction in whichthe display control unit further, when the judgement unit judges thatthe housing unit is in the folded state, has the taken image of thesubject displayed on the first display.

According to the stated construction, an image that has been taken canbe displayed on the display while the mobile communication terminal isin a folded state, therefore the user can enjoy looking at images in aplace where there is little space, such as a crowded train, withoutbothering others.

Here, the mobile communication terminal may have a construction in whichthe lens is positioned on a different outer surface of the housing unitto the first display, and the display control unit, when the judgmentunit judges that the housing unit is in the unfolded position, has theimage displayed on the first display in a direction that is upside-downcompared to a direction in which images are displayed when the judgementstep judges that the housing unit is in the folded position.

According to the stated construction, if the mobile communicationterminal is unfolded in order to take an image, the display direction isput upside-down if the display is upside-down, therefore the displaydisplays the subject taken by the camera in the correct direction. As aresult, the user can start taking an image without delay.

Here, the mobile communication terminal may have a construction in whichthe camera unit includes: an emission sub-unit for emitting visiblelight from a position adjacent to the lens, and the display control unitincludes: an instruction receiving unit for receiving from a user (a) apreparation instruction for having images of a subject displayed on atleast one of the displays successively after each image has been taken,and (b) a still image taking instruction for having a still image of thesubject displayed on at least one of the displays, and the displaycontrol unit, on the instruction receiving unit receiving thepreparation instruction, has the emission sub-unit emit the visiblelight, and, on the instruction receiving unit receiving the still imagetaking instruction, has the emission sub-unit stop emitting the visiblelight.

According to the stated construction, the user can estimate the positionof the lens and the position of the subject being taken by the lens byusing the visible light as a guide when it is dark. As a result, theuser can easily adjust him/herself to be in a position taken by thelens, and the process of taking an image can be finished promptly.

Here, the mobile communication terminal may have a construction in whichthe first display includes: a light emission unit for emitting light,and the display control unit includes: an instruction receiving unit forreceiving a still image taking instruction for having a still image of asubject displayed on at least one of the two displays, directly afterthe still image has been taken.

According to the stated construction, even when taking an image in adark place, light exposure can be supplemented, and the display alsofunctions as a photographic lamp for the camera. Therefore, thecompactness of the mobile communication terminal is used effectively.

Here, the mobile communication terminal may have a construction in whichthe display control unit has, when the judgement unit judges that thehousing unit is in the unfolded state, the taken image of the displayedon one of the displays, the display control unit further includes: auser instruction receiving unit for receiving a display selectioninstruction for switching over the display to perform image display, andthe display control unit, on the user instruction receiving unitreceiving the display selection instruction, has the display performingimage display turned off and the image displayed on the selecteddisplay.

According to the stated construction, the display that is not used intaking an image is turned off in response to user instruction. Thisreduces consumption of the battery.

Furthermore, the present invention is a foldable mobile communicationterminal, including: a housing unit that is composed of a top housingand a bottom housing that are connected via a connection unit that actsas a pivot so that the housing unit is foldable and unfoldable; twodisplays; a camera unit for taking an image of a subject through acamera lens that is positioned on an outer surface of a same of the tophousing and the bottom housing as the first display, so as to be visiblein a same view as the first display when the housing is in an unfoldedstate, an instruction receiving unit for, when the housing is in thefolded state, receiving from a user (a) a preparation instruction forhaving images of a subject displayed on at least one of the displayssuccessively after each image has been taken, and (b) a still imagetaking instruction for having a still image of the subject displayed onat least one of the displays, and a display control unit for havingimages displayed successively on the first display, on the instructionreceiving unit receiving the preparation instruction, and having thestill image displayed on the first display, on the instruction receivingunit receiving the still image taking instruction. Here, the firstdisplay may be fixed on the outer surface of the housing unit, and thesecond display may be fixed on the inner surface of the housing unit.Here, the mobile communication terminal may be a foldable mobiletelephone that includes numeric keys for receiving an input of atelephone number, the numeric keys being on a same surface as one of thefirst display and the second display.

According to the stated construction, an image can be taken with themobile communication terminal in the folded state, therefore the usercan take an image straight away on finding a suitable subject.

Furthermore, the present invention is a display control method for afoldable mobile communication terminal that includes (a) a top housingand a bottom housing that are connected via a connection unit that actsas a pivot so that the housing unit is foldable and unfoldable, (b) twodisplays, the first display being positioned on an outer surface of oneof the top housing and the bottom housing and being visible when thehousing unit is in a folded state, and the second display beingpositioned on an inner surface of one of the top housing and the bottomhousing and not being visible when the housing unit is in the foldedstate, and (c) a camera unit for taking an image of a subject through acamera lens that is positioned on one of the outer surface and the innersurface of one of the top housing and the bottom housing, so as to bevisible in a same view as one of the displays when the housing is in anunfolded state, the display control method including: a judgement stepfor judging whether the housing is in the unfolded state or in thefolded state; and a display control step, when the judgement step judgesthat the housing unit is in the unfolded state, for having the takenimage displayed on at least one of the two displays. Here, the firstdisplay may be fixed on the front surface of the housing and the seconddisplay may be fixed-on the back surface of the housing, and the mobileinformation terminal may be a mobile telephone that includes a numerickey pad for inputting a telephone number, the numeric key pad being on asame surface as one of the first display and the second display.

According to the stated construction, the mobile communication terminalcan be carried in a convenient, folded state, and an image taken as soonas the mobile communication terminal has been put into an unfoldedstate. Therefore, the mobile communication terminal can be easilycarried anywhere, and the user can easily take an image when he/shefinds a suitable subject.

Here, the lens may be positioned on a different outer surface of thehousing to the first display, and the display control step may, when thejudgment step judges that the housing is in the unfolded position, havethe image displayed on the first display in a direction that isupside-down compared to a direction in which images are displayed whenthe judgement step judges that the housing unit is in the foldedposition.

According to the stated construction, if the mobile communicationterminal is unfolded in order to take an image, the display direction isput upside-down if the display is upside-down, therefore the displaydisplays the subject taken by the camera in the correct direction. As aresult, the user can start taking an image without delay.

Here, the camera unit may include an emission sub-unit for emittingvisible light from a position adjacent to the lens, and the displaycontrol step may include: an instruction receiving sub-step forreceiving from a user (a) a preparation instruction for having images ofa subject displayed on at least one of the displays successively aftereach image has been taken, and (b) a still image taking instruction forhaving a still image of the subject displayed on at least one of thedisplays, and the display control step may, on reception of thepreparation instruction, has the emission unit emit the visible light,and, on reception of the still image taking instruction, has theemission unit stop emitting the visible light.

According to the stated construction, the user can estimate the positionof the lens and the position of the subject being taken by the lens byusing the visible light as a guide when it is dark. As a result, theuser can easily adjust him/herself to be in a position taken by thephotographic lens, and the process of taking an image can be finishedpromptly.

Here, the first display may have a light emission unit for emittinglight, and the display control step may include: an instructionreceiving sub-step for receiving a still image taking instruction forhaving a still image of a subject displayed on at least one of the twodisplays, directly after the still image has been taken, and the displaycontrol step may, on the instruction receiving sub-step receiving thestill image taking instruction, have the light emission unit emit light.

According to the stated construction, even when taking an image in adark place, light exposure can be supplemented, and the display alsofunctions as a photographic lamp for the camera. Therefore, thecompactness of the mobile communication terminal is used effectively.

Here, the display control step may, when the judgement step judges thatthe housing is in the unfolded state, have an image displayed on one ofthe displays directly after the image has been taken.

According to the stated construction, the display that is not used intaking an image is turned off in response to user instruction. Thisreduces consumption of the battery.

BRIEF DESCRIPTION OF THE DRAWINGS

These and other objects, advantages and features of the invention willbecome apparent from the following description thereof taken inconjunction with the accompanying drawings which illustrate a specificembodiment of the invention.

In the drawings:

FIGS. 1A to 1C show outer views of a folding mobile communicationterminal 1 of the present embodiment in an unfolded state,

FIG. 1A showing a front view,

FIG. 1B showing a right side view, and

FIG. 1C showing a back view;

FIG. 2 is a function block drawing showing the structure of the foldingmobile communication terminal 1;

FIG. 3 is a flowchart showing a process performed by a control unit 10for controlling display of an image of the subject taken by a cameraunit 22;

FIGS. 4A to 4C show image display examples displayed on a sub-display 21and a main display 13 of the folding mobile communication terminal 1before and after preparation for taking an image,

FIG. 4A showing a display example before preparation of non-image-takinginformation,

FIG. 4B showing an example after preparation of an image that has beentaken being displayed upside-down on the sub-display 21, and

FIG. 4C being a display example after the image has been taken of theimage being displayed on the main display 13;

FIG. 5 is a flowchart showing a process performed by the control unit 10for controlling display of an image of a subject taken by the cameraunit 22, when a laser emitting device is used in the camera unit 22;

FIGS. 6A and 6B show outer views of a non-folding mobile communicationterminal,

FIG. 6A showing a positioning example of the sub-display 21 and thecamera unit 22 on the back, and

FIG. 6B showing an outer view of the front;

FIG. 7 is a flowchart showing a process performed by the control unit 10for controlling display of an image taken by the camera unit 22 of asubject, when a display selection key is provided in an operation unit14;

FIG. 8 is a flowchart showing a process performed by the control unit 10controlling display of an image taken by the camera unit 22 of asubject, when the camera unit 22 in FIG. 7 further includes a laseremitting device;

FIG. 9 is an outer view of an example of the appearance of the foldingmobile communication terminal 1 when both the sub-display 21 and thecamera 22 are provided on the same housing;

FIG. 10 is a flowchart showing a process performed by the control unit10 for controlling display of an image taken by the camera unit 22 of asubject, when the sub-display 21 and a lens of the camera 22 are bothpositioned on an outer surface of either housing 11 or housing 12; and

FIG. 11 is a flowchart of showing a process performed by the controlunit 10 controlling display of an image taken by the camera unit 22 of asubject, when the camera unit 22 in FIG. 10 further includes a laseremitting device.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

The following describes a portable communication terminal of the presentinvention in detail with reference to the drawings.

FIGS. 1A to 1C show outer views of a folding mobile communicationterminal 1 (hereinafter “communication terminal 1”) of the presentembodiment in an unfolded state. Specifically, FIG. 1A shows a frontview, FIG. 1B shows a right side view, and FIG. 1C shows a back view.

The communication terminal 1 includes housing 11, housing 12, a maindisplay 13, an operation unit 14, a microphone 15, a detection unit 16,a receiver 17, an earphone terminal 18, an antenna 19, a speaker 20, asub-display 21, and a camera unit 22.

For convenience, here the housing 11, the housing 12, the detection unit16, a side key 14 i included in the operation unit 14, and the earphoneterminal 18 are described below, while other components are describedlater.

The housing 11 and 12 are connected by a central hinge unit 23 to formfoldable housing. The main display 13 and the receiver 17 are positionedon the inner surface of the housing 11 (the surface shown in FIG. 1A),while the speaker 20 and the sub-display 21 are provided on the outersurface (the surface shown in FIG. 1C).

The operation unit 14 and the microphone 15 are provided on the innersurface of the housing 12 (the surface shown in FIG. 1A), while the sidekey 14 i that functions as a shutter button for taking an image with thecamera unit 22 is positioned on the side.

The side key 14 i is used when taking an image with the camera unit 22,and is structured to have two states: a state in which the key ispartially pressed down (hereinafter “half-pressed state”) and a state inwhich the key is fully pressed down (hereinafter “fully-pressed state”).In the half-pressed state the control unit 10 (FIG. 2) is given apreparation instruction, and in the fully-pressed state the control unit10 is given a still image taking instruction.

A further function of the side key 14 i is instructing the control unit10 to read data of an image data that has been taken and display theimage data on the sub-display 21, when the detection unit 16 detectsthat the communication terminal 1 is in a folded state and if thefully-pressed state is maintained for at least a predetermined length oftime (for example, three seconds).

Here, “preparation instruction” denotes an instruction to have thecamera unit 22 start taking images of the subject, and have the data ofeach image displayed successively on the main display 13 or thesub-display 21 directly after each image is taken.

Here, “still image taking instruction” denotes an instruction for havingimage data displayed on the main display 13 or the sub-display 21 as astill image directly after an image has been taken.

The detection unit 16 detects mechanically whether the communicationterminal 1 is in an unfolded state (including a partially unfoldedstate) or in a folded state. For example, a protruding unit is providedon the housing 11 (FIG. 1A, 16 a), and the detection unit 16 detectsmechanically whether the communication terminal 1 is in a folded stateaccording to whether the protruding unit is applying pressure to thedetection unit 16. When the detection unit 16 detects that pressure isbeing applied by the protruding unit, it outputs a detection signal tothe control unit 10.

It is also possible to detect whether the communication terminal 1 isfolded or unfolded by use of other conventional techniques such as anoptical sensor detecting that the communication terminal 1 is in anunfolded state, or by an encoder detecting the angle at which thecommunication terminal 1 is unfolded.

The earphone terminal 10 is a terminal for connecting an earphonemicrophone.

FIG. 2 is a function block drawing showing the structure of thecommunication terminal 1. As FIG. 2 shows, the communication terminal 1is composed of an antenna 19, a transmission/reception unit 8, amodulation/demodulation unit 9, a control unit 10, a main display 13, asub-display 21, a camera unit 22, a camera I/F (interface) 25, anoperation unit 14, an audio processing unit 24, a microphone 15, and areceiver 17.

The antenna 19 receives and transmits communication waves.

The transmission reception unit 8 performs transmission and reception ofcommunication data as communication waves. Here, “communication data”denotes call audio data, electronic mail data, character information,image data, control data used for communication control, and so on.

The modulation/demodulation unit 9 modulates communication data fortransmission, and also demodulates communication data for receptionwhich it then outputs to the audio processing unit 24.

The control unit 10 includes, for example, a microprocessor, a ROM (ReadOnly Memory) 10 a, and a RAM (Random Access Memory) 10 b, and performsvarious types of control, according to control programs stored in theROM 10 a, such as display control of images taken by the camera unit 22.The control unit 10 follows the programs stored in the ROM 10 a tocontrol images taken by the camera unit 22, and controls display ofimages based on instructions from the user via the side key 14 iregarding taking images, (preparation instructions, still image takinginstructions), and detection signals from the detection unit 16.

Note that details of the display control performed by the control unit10 are described later.

The ROM 10 a stores the control programs. The RAM 10 b temporarilystores data to be transmitted, data that has been received, data ofimages that have been taken, and other data such as telephone directorydata.

The main display 13 is composed of a color LCD device, a DMD (digitalmirror device), an organic EL (electro luminescence) display device, aPDP (plasma display panel), or a similar device. The main display 13displays images taken by the camera unit 22 (moving images orintermittent images displayed in substantially real time after apreparation instruction and before a still image taking instruction, astill image that has been taken after a still image taking instruction),information to be notified such as incoming-communication history,character information such as e-mail and telephone directory data, thepresent time, etc. Note that when a detection signal showing that thecommunication terminal 1 has been put into a folded state is received bythe control unit 10, the control unit 10 has the main display 13 turnedoff, or has a back light (not illustrated) in the main display turnedoff.

The sub-display 21 is composed of a color LCD device, a DMD, an organicEL display device, a PDP, or a similar device. When the detection unit16 outputs a detection signal showing that the communication terminal 1is in a folded state, the sub-display 21 displays information that doesnot relate to taking images (hereinafter “non-image-taking information”)such as a stand-by display, information to be notified to the user suchas incoming-communication history, the present time, image data that hasbeen stored in the RAM 10 b, and so on. When the detection unit 16 isnot outputting a detection signal, i.e., when the communication terminal1 is in an unfolded state, the sub-display 21 displays images taken bythe camera unit 22 (moving images or intermittent images displayed insubstantially real time after a preparation instruction and before astill image taking instruction, a still image that has been taken aftera still image taking instruction). Here, the sub-display 21 displaysthese images in the opposite direction (hereinafter referred to as“upside-down”) to the non-image taking information.

Furthermore, the sub-display 21 also has a light emission device such asa stroboscope to supplement light if exposure is insufficient whentaking an image in a dark place. The light emission device emits lightby the control unit 10 in response to a light emission instruction ondetection of a still image taking instruction.

Furthermore, the sub-display 21 further includes a lamp that flasheswhen the communication terminal 1 receives incoming-communication, andis red when the batteries are being recharged. It also includes a backlight that lights up the sub-display 21.

The camera unit 22 is connected to the control unit 10 via a flexiblecable and a camera I/F, and has a built-in camera. An image is formed onphotodetecting surfaces of semiconductor photodetector elements via thecamera lens. The camera lens is positioned on the housing 12 as shown by22 in FIG. 1C. The image is converted to an electric signalcorresponding to the intensity of the incident light received at eachphotodetector. Then the electric signals are further A/D converted, andoutput as image data via the camera I/F 25 to the RAM 10 b. A CCDcamera, a CMOS (Complementary Metal Oxide Semiconductor) camera, or thelike is used for the internal camera.

The camera unit 22 may have a laser emitting device for emitting a laserbeam via a small hole provided on the surface of the housing 12 adjacentto the lens of the internal camera (for example, immediately above orimmediately below the lens). In this case, the laser emitting deviceemits a red laser beam from the small hole on receiving a laser beamemission instruction from the camera I/F 25, and stops emitting thelaser beam on receiving an emission stop instruction from the camera I/F25. This laser emitting device acts as a guide for the user to estimatethe position of the lens and the position of the subject being takenthrough the lens when taking an image in a dark place. As a result theuser can easily adjust his/her position in relation to the position ofthe lens when taking an image of him/herself. As a result, the processof taking an image can be completed promptly. Note that a colored-lightdevice that emits colored light may be used instead of a laser emittingdevice. The camera I/F 25 outputs various types of control instructionsto the camera unit 22, in response to instructions from the control unit10. Specifically, on receiving a preparation instruction from thecontrol unit 10, the camera I/F unit 25 instructs the camera unit 22 totake images of a subject and to successively output the image data ofeach image that has been taken, and then on receiving a still imagetaking instruction, instructs the camera unit 22 to take a still imageand to output data of the still image. Furthermore, the camera I/F 25reads the image data output from the camera unit 22, and outputs theread image data to the RAM 10 b.

Note that the if the camera unit 22 has a laser emission device, thecamera I/F 25, in addition to the aforementioned instructions, instructslaser beam emission on receiving a preparation instruction from thecontrol unit 10. Then, on receiving a still image taking instruction,the camera I/F 25 instructs the camera unit 22 to take a still image andto output data of the still image.

The operation unit 14 has various function keys for receivinginstructions from the user. For example, in the example in FIG. 1A, theoperation unit 14 is composed of a flexible key 14 a, a four-point key14 b, an e-mail key 14 c, an OK key 14 d, and end key 14 e, numeric keys14 f, a web key 14 g, a start key 14 h, and the side key 14 i.

Note that the functions and positioning of the function keys in FIG. 1Aare shown as an example, and are not limited to this example.

The function of the flexible key 14 a is designated according to thecontent of the screen displayed of the main display 13. For example, theflexible key 14 a functions as a function key for having a menuselection screen displayed when the stand-by screen is being displayed,and functions as a function selection key for the user to select adesired menu when a menu selection screen is being displayed.

The four-point key 14 b is a key for moving the cursor up, down, leftand right. Depending on the screen being displayed on the main display13, the four-point key 14 b functions as a key for setting the volume,for reading out a telephone number, and as a key for convertingcharacters of the Japanese alphabet into Chinese characters.

The e-mail key 14 c is for having an e-mail screen displayed.

The OK key 14 d is for confirming a selection selected using theflexible key 14 a from a menu.

The end key 14 e is for turning the power on and off, and for ending atelephone call.

The numeric keys 14 f are for inputting telephone numbers, characters,etc.

The web key 14 g is for having a screen that displays an Internetconnection function displayed.

The start key 14 h is for starting call initiation or call reception.

Note the above-described keys may be push-button keys, a touch panel, ora dial.

The audio processing unit 24 D/A converts communication data that hasbeen output by the modulation/demodulation unit 9, and outputs theconverted data as an audio signal to the receiver 17. The audioprocessing unit 24 also converts audio input from the microphone 15 toan audio signal, and outputs the audio signal to themodulation/demodulation unit 9.

The microphone 15 outputs input audio to the audio processing unit 24.

The receiver 17 reproduces audio from an audio signal output by theaudio processing unit 24.

The following describes control processing performed by the control unit10 for displaying images taken by the camera unit 22. FIG. 3 is aflowchart showing the above-described processing.

The control unit 10 judges whether a preparation instruction has beeninput by the user, by detecting whether an operation-signal is beinggenerated by the side key 14 i being partially pressed (step S1001), andwhen an operation signal has been generated (step S1001:Y), the controlunit 10 judges whether the communication terminal 1 is in an unfoldedstate by judging whether a detection signal is being input from thedetection unit 16 (step S1002).

When a detection signal is not being input (step S1002: N), the controlunit 10 judges that the communication terminal 1 is in an unfoldedstate, instructs the camera unit 22 to output image data of the subjectvia the camera I/F 25, and has the image data, which is successivelyoutput, displayed upside-down on the sub-display 21 in substantiallyreal time (step S1003). Furthermore, the control unit 10 also has theimage data displayed on the main display 13 (not upside-down) (stepS1004), and then judges whether a still image taking instruction hasbeen input by the user, by whether an operation signal has beengenerated according to the side key 14 i is being fully pressed down(step S1005).

When a still image taking instruction has been input (step S1005: Y),the control unit 10 instructs light emission by the light emissiondevice of the sub-display 12 (step S1006). Furthermore, the control unit10 instructs, via the camera I/F 25, the camera unit 22 to take a stillimage of the subject and to output data of the still image, and has thestill image data displayed upside-down on the sub-display 21 (stepS1007). Furthermore, the control unit 10 has the still image datadisplayed on the main display (not upside down) (step S1008).

Furthermore, at step S1001, when a preparation instruction has not beeninput (step S1001:N), or at step S1002 when a detection signal is notdetected (step S1002:Y), the control unit 10 displays non-image-takinginformation on the sub-display 21 (step S1009).

FIGS. 4A to 4C show examples of images displayed on the sub-display 21and the main display 13 of the communication terminal 1 before and afterpreparation for taking an image. FIG. 4A shows an example of displayinformation on the sub-display 21 when an image is not being takenbefore preparation for photography, FIG. 4B shows an example after apreparation instruction has been input of image data being displayedupside-down on the sub-display 21 directly after being taken, and FIG.4C is a display example after an image has been taken of the image beingdisplayed on the main display 13.

The following describes control processing performed by the control unit10 for displaying an image taken by the camera unit 22, when the cameraunit 22 has a laser emitting device.

FIG. 5 is a flowchart showing the above-described processing. Steps inthe flowchart in FIG. 5 that are the same as those in FIG. 3 have thesame numbering, and a description thereof is omitted. The followingdescribes the processing shown in the flowchart in FIG. 5 that differsfrom the processing the flowchart in FIG. 3.

After the processing at step S1001, when a detection signal is not beinginput at step S1002 (step S1002:N), the control unit 10 instructs thecamera unit 22 via the camera I/F 25 to emit a laser beam (step S1101).The control unit 10 performs the processing from steps S1003 to S1004,and at step S1005, on reception of a still image taking instruction(step S1005:Y), instructs the camera unit 22, via the camera I/F 25, tostop emission of the laser beam (step S1102). Then the control unit 10performs the processing from steps S1006 to S1008.

This completes the description of the embodiment of the presentinvention, however the present invention is not limited to theabove-described embodiment.

For example, the mobile communication terminal of the embodiment of thepresent invention is described as, but not limited to being, a foldingcommunication terminal. FIG. 6A shows an example of the placement of thesub-display 21 and the camera unit 22 on the back of a non-foldingmobile communication terminal. FIG. 6B shows an outer view of the frontof such a mobile communication terminal. In this case, step S1002 in theflowcharts in FIGS. 3 and 5 is unnecessary, and the display in stepS1003 is performed in the same direction as display of non-image-takinginformation.

Furthermore, in the embodiment of the present invention, the camera unit22 is positioned on the back of the housing 12, but the camera 12 maypositioned on the front of the housing 12, or on the front of thehousing 11.

Furthermore, in the embodiment of the present invention, as shown in theflowcharts in FIGS. 3 and 5, data of an image is shown displayed on boththe main display 13 and the sub-display 21 directly after being taken,but the image data may be displayed one of the displays, and the otherdisplay turned off. Here, a display selection key may be provided in theoperation unit 14 (for example, the flexible key 14 a), and the user mayselect the desired display using this key. Flowcharts in FIGS. 7 and 8show display control processing performed in such a case by the controlunit 10 that corresponds to the flowcharts in FIGS. 3 and 5.

Furthermore, in the embodiment of the present invention, as shown inFIG. 1C, the sub-display 21 and the lens of the camera unit 22 arepositioned on the outer surfaces of the housing 11 and housing 12respectively, but both may be positioned on either the housing 11 or thehousing 12, and in response to preparation instructions and still imagetaking instructions from the user, an image may be taken with thehousing in a folded state, and the resulting image displayed on thesub-display 21 in the same direction as non-image-taking information.FIG. 9 shows an example of an outer view of the communication terminal 1when both the sub-display 21 and the camera unit 22 are positioned onthe same housing. Flowcharts in FIGS. 10 and 11 show display controlprocessing performed in such a case by the control unit 10 thatcorresponds to the flowcharts in FIGS. 3 and 5.

1. A mobile communication terminal comprising: a camera unit for takingan image of a subject through a camera lens; two displays, a firstdisplay being positioned on a same front surface of body of the mobilecommunication terminal as the camera lens so as to be visible in a sameview as the camera lens, and a second display being positioned on a backsurface of the body; display control means for having the image taken bythe camera unit displayed on at least one of the two displays; whereinthe first display is fixed on the same front surface of the body and thesecond display is fixed on the back surface of the body, the mobilecommunication terminal is a mobile telephone that includes numeric keysfor receiving an input of a telephone number, the numeric keys being ona same surface as one of the first display and the second display, thedisplay control means has the taken image of the subject displayed ononly one of the two displays, the display control means includes: a userinstrutction reception unit for receiving from a user a displayselection instruction for switching over the display displaying thetaken image, and the display control means, on receiving the displayselection instruction, turns off the display performing image display,and has the image displayed on the selected display.
 2. The mobilecommunication terminal of claim 1, wherein the camera unit includes; anemission sub-unit for emitting visible light from a position adjacent tothe camera lens, so as to provide a guide showing a position of thecamera lens, and the display control means includes: an instructionreceiving unit for receiving from a user (a) a preparation instructionfor having images of a subject displayed on at least one of the displayssuccessively after each image has been taken, and (b) a still imagetaking instruction for having a still image of the subject displayed onat least one of the displays, and the display control means, onreception of the preparation instruction by the instruction receivingunit, has the emission sub-unit emit the visible light, and, onreception of the still image taking instruction by the instructionreceiving unit, has the emission sub-unit stop emitting the visiblelight.
 3. The mobile communication terminal of claim 1, furthercomprising: storage means for storing data of the taken image of thesubject; electronic mail receiving means for receiving from the user aninput of an electronic mail address; and transmission means fortransmitting the stored image data to a mail server specified by theelectronic mail address.
 4. A foldable mobile communication terminal,comprising: a housing unit that is composed of a top housing and abottom housing that are connected via a connection unit that acts as apivot so that the housing unit is foldable and unfoldable; two displays,a first display being positioned on an outer surface of one of the tophousing and the bottom housing and being visible when the housing unitis in a folded state, and a second display being positioned on an innersurface of one of the top housing and the bottom housing and not beingvisible when the housing unit is in the folded state; a camera unit fortaking an image of a subject through a camera lens that is positioned onone of the outer surface and the inner surface of one of the top housingand the bottom housing, so as to be visible in a same view as one of thedisplays when the housing is in an unfolded state; judgment means forjudging whether the housing unit is in the unfolded state or the foldedstate; and display control means for having, when the judgment meansjudges that the housing unit is in the unfolded state, the taken imageof the subject displayed on at least one of the displays directly afterthe image has been taken, wherein the first display is fixed on theouter surface of the housing unit, and the second display is fixed onthe inner surface of the housing unit, the foldable mobile communicationterminal is a mobile telephone that includes numeric keys for receivingan input of a telephone number, the numeric keys being on a same surfaceas one of the first display and the second display, and the displaycontrol means further, when the judgment means judges that the housingunit is in the folded state, has the taken image of the subjectdisplayed on the first display.
 5. The foldable mobile communicationterminal, of claim 4 wherein the camera unit takes an image of a subjectthrough a camera lens that is positioned on an outer surface of the sametop housing or bottom housing as the first display, so as to be visiblein a same view as the first display when the housing is in an unfoldedstate; the foldable mobile communication terminal further comprises:instruction receiving means responsive to when the housing is in thefolded state, for receiving from a user (a) a preparation instructionfor having images of a subject displayed on at least one of the displayssuccessively after each image has been taken, and (b) a still imagetaking instruction for having a still image of the subject displayed onat least one of the displays; and the display control means has theimages displayed on the first display, on the instruction receivingmeans receiving the preparation instruction, and has the still imagedisplayed on the first display, on the instruction receiving meansreceiving the still image taking instruction.
 6. A foldable mobilecommunication terminal-comprising: a housing unit that is composed of atop housing and a bottom housing that are connected via a connectionunit that acts as a pivot so that the housing unit is foldable andunfoldable; two displays, a first display being positioned on an outersurface of one of the top housing and the bottom housing and beingvisible when the housing unit is in a folded state, and a second displaybeing positioned on an inner surface of one of the top housing and thebottom housing and not being visible when the housing unit is in thefolded state; a camera unit for taking an image of a subject through acamera lens that is positioned on one of the outer surface and the innersurface of one of the top housing and the bottom housing so as to bevisible in a same view as one of the displays when the housing is in anunfolded state; judgment means for judging whether the housing unit isin the unfolded state or the folded state; and display control means forhaving, when the judgment means judges that the housing unit is in theunfolded state, the taken image of the subject displayed on at least oneof the displays directly after the image has been taken, wherein thefirst display is fixed on the outer surface of the housing unit, and thesecond display is fixed on the inner surface of the housing unit, thefoldable mobile communication terminal is a mobile telephone thatincludes numeric keys for receiving an input of a telephone number, thenumeric keys being on a same surface as one of the first display and thesecond display, the camera lens is positioned on a different outersurface of the housing unit to the first display, and the displaycontrol means, when the judgment means judges that the housing unit isin the unfolded position, has the image displayed on the first displayin a direction that is upside-down compared to a direction in whichimages are displayed when the judgment step judges that the housing unitis in the folded position.
 7. A foldable mobile communication terminal,comprising a housing unit that is composed of a top housing and a bottomhousing that are connected via a connection unit that acts as a pivot sothat the housing unit is foldable and unfoldable; two displays, a firstdisplay being positioned on an outer surface of one of the top housingand the bottom housing and being visible when the housing unit is in afolded state, and a second display being positioned on an inner surfaceof one of the top housing and the bottom housing and not being visiblewhen the housing unit is in the folded state; a camera unit for takingan image of a subject through a camera lens that is positioned on one ofthe outer surface and the inner surface of one of the top housing andthe bottom housing, so as to be visible in a same view as one of thedisplays when the housing is in an unfolded state; judgment means forjudging whether the housing unit is in the unfolded state or the foldedstate; and display control means for having, when the judgment meansjudges that the housing unit is in the unfolded state, the taken imageof the subject displayed on at least one of the displays directly afterthe image has been taken, wherein the first display is fixed on theouter surface of the housing unit and the second display is fixed on theinner surface of the housing unit, the foldable mobile communicationterminal is a mobile telephone that includes numeric keys for receivingan input of a telephone number, the numeric keys being on a same surfaceas one of the first display and the second display, the display controlmeans has, when the judgment means judges that the housing unit is inthe unfolded state, the taken image of the displayed on one of thedisplays, the display control means further includes: a user instructionreceiving unit for receiving a display selection instruction forswitching over the display to perform image display, and the displaycontrol means, on the user instruction receiving unit receiving thedisplay selection instruction, has the display performing image displayturned off and the image displayed on the selected display.
 8. A displaycontrol method for a foldable mobile communication terminal thatincludes (a) a top housing and a bottom housing that are connected via aconnection unit that acts as a pivot so that the housing unit isfoldable and unfoldable, (b) two displays, a first display beingpositioned on an outer surface of one of the top housing and the bottomhousing and being visible when the housing unit is in a folded state,and a second display being positioned on an inner surface of one of thetop housing and the bottom housing and not being visible when thehousing unit is in the folded state, and (c) a camera unit for taking animage of a subject through a camera lens that is positioned on one theouter surface and the inner surface of one of the top housing and thebottom housing so as to be visible in the same view as one of thedisplays when the housing is in an unfolded state, the display controlmethod comprising: a judgment step for judging whether the housing is inthe unfolded state or in the folded state; and a display control step,when the judgment step judges that the housing unit is in the unfoldedstate, and for having the taken image displayed on at least one or thetwo displays, the first display is fixed on the front surface of thehousing and the second display is fixed on the back surface of thehousing, and the foldable mobile communication terminal is a mobiletelephone that includes a numeric key pad for inputting a telephonenumber, the numeric key pad being on a same surface as one of the firstdisplay and the second display, the camera lens is positioned on adifferent outer surface of the housing to the first display, and thedisplay control step, when the judjement step judges that the housing isin the unfolded position, has the image displayed on the first displayin a direction that is upside-down compared to a direction in whichimages are displayed when the judgment step judges that the housing unitis in the folded position.